Hammer mill



Nov. 18, 1930.

c. A. JAMISON 1,781,904

HAMMER MILL Filed June 30, 1928 2 Sheets-Sheet l INVENTOR: 4/ Charles A. J mi Atty.

Nov. 18, 1930. Q A JAMISQN 1,781,904

HAMMER MILL Filed June 50, 192

2 Sheets-Sheet 2 INVENTOR:

Charles; A. Jami tty;

the ends of the grate bars 11 may rest firmly upon the seat formed by the recess 16.

When in the condition of use, the pivotal 1y mounted portion 1 of the frame carrying the breaker plate and grate bars is bolted or otherwise secured to the fixed portion 1 sup-I porting the cross member 15 detachable bolts 1 for such purpose being shown in the drawings, and such movable portion may also be secured to the base. '7

The curve of the grate bars follows in its greater extent the path of the beaters or hammers so that any material dumped into the crusher and arrested and/0r. temporarily supported by said grate bars is subjected to a nipping action by the ends of said beaters or hammers, whose path of action is clearly indicated in Fig.

' This crusher is designed to act upon what may be termed steam shovel'feed which will include portions of rock, ore, coal,'and/ or the same where such material will be subjected to further impact by the beaters or hammers 6 to effect the desired reduction.

The facesof'the supporting ends 11 of the grate bars may be disposed in line with the wear members 10 carried by the breaker plate and serve in some measure as a part of the anvil against which the material supported by said grate bars is crushed.

When it is desired to gain access to the rotor structure for the purpose of repair or replacement of the beaters or hammers, or for the purpose of entirely removing the rotor structure, the portion 1 of the crushing frame carrying the breaker plate 7 may be disconnected from the fined portion 1 of the frame by removing the bolts 1, and then turned back on its hinge with the cross rod 9, as indicated by the broken'lines in Fig 1. This position of such movable portion also permlts removal and l f n of the gm 1 between the bars of said grate into said hopbars 11.

I claim: j v

1. A crushing structure comprising a hopper for the material to be crushed having its bottom made up of spaced bars inthe form of a grate, rotary beaters adapted to pass between the bars of said grate into said hopper, a pivotally mounted support for the bars of said grate to which they are fixed at a point 7 adjacent said pivot, and atransverse support upon which the opposite ends of said grate bars may freely rest.

2.;A crushing structure'comprising a hopper for the material to be crushed having its bottom ma'de'up of spacedbarsin the form of a grate, rotary beaters adapted to pass.

between the barsof said grate into said hopper, a pivotally mounted breaker plate to which the bars of said grate are connected,

a transverse support for the opposite ends] of said grate bars, and means connecting the ends of the several bars restlng upon sald support.

3. A crushing structure comprising a hopper for the material to be crushed having its bottom made up of 'a'plurality of curved grate bars, rotary beaters adapted to pass between the bars of said grate into said hopper, a pivotally mounted support for said grate bars to which they are secured at a point adjacent said pivot, a transverse support upon which the opposite endsof said grate bars may;

freely rest, and means for connecting the ends of the bars-resting uponsaid support.

4. A crushing structure comprising a hopper for the material to be crushed having its bottom made up of a plurality of curved grate bars, rotary beaters adapted to pass.

viding a hopp er-for the material to becrushed; said hopper having its bottom made up of spaced bars in the form of a grate,

rotary beaters adapted to pass between the bars of said grate into said hopper the bars of' said grate being fixed to-said pivotally mounted portion, a transverse support for the opposite ends of said grate bars, and means for connecting the ends-of the bars resting upon said support. 7 H e 6. A crushing structure comprising a fixed portion and a pivotally mounted portion providing a hopperi for the material to be I crushed said hopper having its bottom made up of spacedbarsin the form of a grate and said pivotally mounted portion including a breaker plate, rotary beaters adapted to pass per the bars of said grate being fixed to said pivotally mounted breaker plate, a transverse support for the opposite ends of saidgrate bars, and means for connecting theends of said bars resting upon said support.

7 A crushing structure comprising a fixed portion and a pivotally mounted portion providing between them a hopper for the material to be crushed; said hopper having its bot-,

tom made up of a plurality of curved grate bars, rotary beaters adaptedto pass between posite ends of said grate bars, and means connecting the ends of the bars resting upon said support.

8. A crushing structure comprising a fixed portion and a pivotally mounted portion providing between them'a hopper for the mate rial to be crushed; said hopper having its bottom made up of a plurality of curved grate bars and said pivotally mounted portion including a breaker plate, rotary beaters adapted to pass between the bars of said grate into said hopper; eachof said grate bars having a flanged end, means for securing said flanged ends to the breaker plate, a transverse support for the opposite ends of said bars, and means connecting together the ends of the bars resting upon said transverse support.

9. In a crushing structure of the character described, the combination of a frame having a fixedportion, a rotary hammer-carry ing member supported by the same, a hopper for the material to be crushed disposed above said rotor structure, bars forming a grate for the bottom of said hopper, a pivotally mounted support to which the ends of said grate bars are connected forming one wall of said hopper, a transversesupport carried by the fixed portion of the frame upon which the opposite end of said grate bars may rest and forming the opposite wall of the hopper, and a connection for the ends of said bars resting upon said transverse support. V

10. In a crushing structure of the character described, the combinationof a frame having a fixed portion, a rotary hammercarrying member supported by the same, a hopper for the material to be crushed disposed above said rotor structure, bars form.- ing a grate for the bottom of said hopper, a pivotally mounted support toiwhich the ends of said grate bars are connected forming one wall of said hopper, a cross member carried by the fixed portion of the frame upon which the opposite end of said grate bars may rest and forming the opposite wall of the hopper, and a connection carried by'the pivotally mounted support for the ends of the bars resting upon said cross member,

11. In a crushing structure of the character described, the combination of a frame including a base, a fixed portion secured to i said base and a portion pivotally connected to said base, a rotary hammer-carrying member supportedby the base, a hopper for the material to be crushed provided by said fixed and pivotally mounted portions and disposed above said rotor structure, bars forming a grate for the bottom of said hopper; said bars having one end fixed to said pivotally mounted portion, a shelf carried by the fixed portion of the structure upon which the opposite end of said grate bars may rest, a connection for the ends of said bars resting upon said shelf, and means for said frame-site the fixed portions/hereof;

securing iathe pivotally mounted portion of .12. Ina? cnushing structure ofxtihe character described, the combination ofa frame includim-g iaebase, 1a fixed portion securedrto one end of said baseandaportionpivotally connectedito' the opposite end of Vsaidfbasej, a a

rotary hammer-carrying memberysupponted by teena e, hopper Fforfthe material to be crushed provided by said fixed and pivotally mounted portions and'disposed above said rotor structure, bars forming a grate for the bottom of said hopper; said bars havingone endfixed to saidpivotally mounted portion, a cross member forming a'shelf carried by the fixed portion of the structure upon which theopposite end of said-grate bars may rest, a rod passing through the walls of the pivotally mounted portion and providing a connection for the ends of said bars resting upon said shelf, and means for securing the pivotally mounted portion of v J said frame to the fixed portion thereof.

13. A crushing structure comprising a base, a fixed frame portion surmounting said base, a pivotallymounted frame portion also surmounting said base; said frame portions being normally secured together and providing a hopper for the material to be crushed, a rotary hammer-carrying element supported in said crushing structure, a cage or screen disposed below and cooperating with the hammers ofsaid hammer-carr ing nipping action by the hammers for reduction prior to passage to the space belowthe grate for further action by the hammers of the hammer-carryingelement.

14:. A- crushing structure comprising a base, a fixed frame portion surmounting said base, a pivotally mounted frame portion also surmounting said base; said frame portions being normally secured together and providing a hopper for thematerial to be crushed, a rotary hammer-carrying-element supported in said crushing structure, a

pivotally'mounted cage or screen disposed below and cooperating'with the hammers of said hammer-carrying element, a series of curved grate bars disposed above said cage orscreen and forming the bottom ofsaid hopper; said hammers passing between said bars and into said hopper, and a breaker plate carried by said pivotally mounted portion to which one endof each of said grate bars is secured; said grate bars serving to arrest large masses of the material to be crushed which may be subjected to nipping action by the hammers for reduction prior to passage to the space below the grate for further action by the hammers of the hammer-carrying ele- V 5 ment until finally crushed to thedesired size for passage through said cage or screen.

In Witness whereof I have signed this specification.

' CHARLES A. JAMISON. 

